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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478ed31142c57aa6c9775d0e78f0a4829cc4e45cfdc7bcd531782bc5a8c66ea8' 
  AND token = 'qoo7QSm3P9bd8Rw0B97cEbTNI2Lqw+WbYhXqsWcCNko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}